Attaching a New PVC Drain Trap to a Galvanized Stub Out: A Comprehensive Guide

Renovations and modernizing your sink plumbing can often require attaching a new PVC drain trap to a galvanized stub out. This process, although straightforward, involves several steps and techniques to ensure a seamless and leak-free installation. This guide will walk you through the process, including recommended tools and materials.

Understanding the Pipeline

The first step is to determine the appropriate pipe size. The stub out should be either 1-1/4” or 1-1/2”. To measure the stub, use an inside diameter caliper or ruler to assess its diameter. Once you have this measurement, it's time to purchase a PVC trap that fits this size perfectly.

Preparation and Selection

Before you begin the installation, take detailed pictures of the drain area under the sink. These photos can be incredibly helpful when visiting your local hardware store for the necessary parts. Most hardware stores have plumbing experts on hand who can assist you in selecting the correct components.

Tools and Materials

To attach the PVC drain trap, you'll need the following:

PVC drain trap and parts Wires and wire brushes (for cleaning threads) A wire brush Adapters (if converting from galvanized to PVC) Fernco fittings (if preferred) Thread seal tape Screwdriver or socket set Hose clamps (for Fernco fittings)

Installation Process

The installation process involves several steps:

Corrosion Check: Inspect the galvanized stub out for any signs of corrosion or damage. If necessary, clean the inside of the stub with a wire brush to ensure a smooth connection. Thread Cleaning: Using a wire brush, clean the threads on the stub out and the end of the PVC pipe. This will help create a better seal and prevent leaking. Part Placement: The PVC drain trap should fit snugly into the galvanized stub out. If you are using an adapter, insert it between the galvanized stub and the PVC pipe for a proper transition. Securing the PVC Pipe: Secure the PVC pipe to the galvanized stub with the included nut and washer. The washer will provide a seal and prevent leaks. Only tighten the nut just past hand-tight; over-tightening can cause the nut to crack. Choosing Fernco Fittings: For a more flexible connection, consider using Fernco fittings. These rubber sleeves with hose clamps create a strong, flexible seal. Ensure you get the correct size for your installation.

Additional Tips

For more detailed guidance, consider visiting online resources for additional tips and tricks. Local hardware stores can also provide valuable assistance, so prepare with detailed photos of your sink and drain area.

Conclusion

Attaching a new PVC drain trap to a galvanized stub out is a common task during renovations and can significantly improve the efficiency and longevity of your plumbing system. By following this comprehensive guide, you can ensure a successful and leak-free installation. If you're unsure about any steps or need further assistance, don't hesitate to consult with a professional plumber.